Mike,
What I meant was, There are say 10 objects of RAM in memory whose type
is DDR. Now my “Product” object has a member variable named “compatibleRAMs”,
and I would like to set an arraylist containing these 10 objects to the “compatibleRAMs”
variable of “Product” object in memory.
I am reading about the “collect” which can be used to create
collections from fact objects in memory. Something like.
When
$prod
: Product (type==’laptop’)
$compatibleRAMs : ArrayList() from collect (RAM (type
== ‘DDR’))
Then
$prod.setCompatibleRAMs($compatibleRAMs);
Am I on the right track ?
-abhay
From:
rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Michael Anstis
Sent: Monday, May 09, 2011 3:52 PM
To: Rules Users List
Subject: Re: [rules-users] FW:
Basic rules question
Abhay,
Do you need a list?
You can assign RAM to COMPUTERS with this:-
when
$c : Computer( $type : type )
$r : RAM( compatibleWith == $type )
then
$c.addRAM( $r );
end
This would add all RAM (in Working Memory) compatible with COMPUTER to computer.
You could use a list of RAM as a Fact in WM and change your rule to use that:-
when
$l : MyList( )
$c : Computer( $type : type )
$r : RAM( compatibleWith == $type ) from $l
then
$c.addRAM( $r );
end
Or you can define a rule to construct the list too:-
when
$l : MyList( $t : typeRAM )
RAM( $c : $t )
then
$l.add( $r )
end
I assume you'd need to differentiate different lists for different types; so I
have shown use of "MyList" which could subclass ArrayList and have a
"Type of RAM" attribute. Drools doesn't "do" generics.
With kind regards,
Mike
2011/5/9 Abhay B. Chaware <Abhay.Chaware@kpitcummins.com>
Wendy,
Thanks for helping me out so far.
I have another question. What if I have all my “RAM”
objects inserted into working memory. How should I write my
rule’s “when” portion to get a collection of all the RAM
objects matching type “DDR” ? In other words, can I get
collection of facts assigned to a variable and use it in the “then”
part ?
Thanks
Abhay
==================================
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
On Behalf Of Wendy Mungovan
Sent: Friday, May 06, 2011 5:47 PM
To: Rules Users List
Subject: Re: [rules-users] Basic
rules question
Q2:
So the rule would be something like:
rule "RAM type"
when
$product: Product(type == "laptop");
then
//you are looking for the best way to set valid RAM
types in the then part of the rule?
$product.setRamType("DDR");
//or
$product.setValidRamOptions( getValidRamOptions("DDR"));
end
where getValidRamOptions would be a custom function included through 'import
function' so you can then load the choices from some where else. Or if
RamOptions were an object in memory you could have a rule like:
rule "RAM type"
when
$product: Product(type == "laptop");
$ramOptions: RAMOptions(type == "DDR");
then
$product.setValidRamOptions( $ramOptions.getList());
end
Wendy
==================================
Regards,
Abhay Chaware
Sr. Designer | KPIT Cummins Infosystems Ltd | Board: +91 020 6652
5000 | Extn: 2989 | abhay.chaware@kpitcummins.com |www.kpitcummins.com
P Please consider the environment before printing this e-mail
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
On Behalf Of Wendy Mungovan
Sent: Friday, May 06, 2011 5:47 PM
To: Rules Users List
Subject: Re: [rules-users] Basic
rules question
Abhay,
Q1: I think that this will depend on how many different products you
have. If there is a small number it is more straight forward to have a
rule for each one (so the 2nd option). This allows all you logic to be in
one place. If there are a large number of products and writing a rule for
each one is intractable you probably would want to look into some
generalizations of the rules. Is that helpful?
Q2: I'm not quite sure what you are getting at in Q2. Are you
trying to write validation rules or rules that are modifying the facts?
Wendy
From: Abhay B. Chaware <Abhay.Chaware@kpitcummins.com>
To: "rules-users@lists.jboss.org"
<rules-users@lists.jboss.org>
Sent: Fri, May 6, 2011 4:59:46 AM
Subject: [rules-users] Basic rules
question
Hi
I am a
newbie to rule based applications and trying to get the concept of rules. I
have couple of questions about rules to start with, not specifically about
Drools though.
Q1 - Should
rules be data/model specific or can/should they be generic or both
==========================================================
e.g.
If selected
product “TYPE” is “laptop”, then category
“RAM” should have all “DDR” type items compatible (
selecting items matching certain property )
OR
If selected
product is “IBM T42”, then category “RAM” should have
“512MB DDR” , “1024MB DDR”, “2048MB
DDR” compatible. ( assigning individual items in rules )
OR
Combination
of both
Q2 –
How should be the data modeled in above case
==========================================================
e.g.
in product
master, each item ( e.g. T40, T42 ) should have a “TYPE” ( e.g.
desktop or laptop ) , all items in category “RAM” should have a
“TYPE” ( e.g. DDR ) and then control the assignment of RAM options
to the PRODUCT through Rule using “DDR” type ?
OR
in product
master, each item ( e.g. T40, T42 ) should have a “TYPE” ( e.g.
desktop or laptop ) , all items in category “RAM” should have
a “compatibleProduct” column ( e.g. desktop or laptop ) and control
the assignment of RAM to PRODUCT through “dynamic” rules by
selecting all the RAMs by passing the “TYPE” of the product to the
database handler.
Am I making
my point clear ?
Thanks
Abhay
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